[Community] unary union counts

[Kevin Dwyer]

Hey all,

I searched the archives but my google-fu isn't finding any matches on this
idea. What I'm interested in is doing a unary_union and that works
famously, but I also want to know the count of geometries that were unioned
in each case. Is there a smart way to accomplish this?

Thanks for some awesome libraries!
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[Sean Gillies]

Hi Kevin,

The GEOS library doesn't expose details about the graph, so the best
Shapely can offer is a count of geometries before (1 number) and a count of
geometries in the result (1 number).

Post by Kevin Dwyer
Hey all,
I searched the archives but my google-fu isn't finding any matches on this
idea. What I'm interested in is doing a unary_union and that works
famously, but I also want to know the count of geometries that were unioned
in each case. Is there a smart way to accomplish this?
Thanks for some awesome libraries!
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[Kevin Dwyer]

Thanks Sean. I dug into libgeos and found the same. I think that I can
solve my problem by comparing the points that I used to generate the
geometries initially with the resulting geometries and get the same result.

Post by Sean Gillies
Hi Kevin,
The GEOS library doesn't expose details about the graph, so the best
Shapely can offer is a count of geometries before (1 number) and a count of
geometries in the result (1 number).

Post by Kevin Dwyer
Hey all,
I searched the archives but my google-fu isn't finding any matches on
this idea. What I'm interested in is doing a unary_union and that works
famously, but I also want to know the count of geometries that were unioned
in each case. Is there a smart way to accomplish this?
Thanks for some awesome libraries!
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--
Sean Gillies
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